Using following item with mqtt and JS transformation String Alarm_State “Alarm [%s]” (gAlarm) { mqtt=“<[homemqtt:Paradox/Events:state:JS(alarmState.js)]”} Sometimes I do receive Paradox/Events mqtt message that do not contain alarm state. Can alarmState.js somehow…

You can use a proxy item and base your logic from that proxy item. [image] Design Pattern: Proxy Item Tutorials & Examples Edit: Updates for OH 4 Please see Design Pattern: What is a Design Pattern and How Do I Use Them for information on what a DP is and how…

I got that idea too, but looks a bit overengineering. And it get quite ugly when you have 20 such items. I would expect javascript null does the job here. Another solution is to write bogus javascript that will throw exception in case there is no required value, it does the job, but then log is too …

Can Javascript transformation service return "no change value"?

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luckymallari (Lucky) January 2, 2018, 2:28pm 2

You can use a proxy item and base your logic from that proxy item.

You can also use persistence. On a rule, check if updated value is an accepted value. If not, restore previous state.